Properties of the Number 18091

Eighteen Thousand Ninety-One

Basics

Value: 18090 → 18091 → 18092

Parity: odd

Prime: No

Previous Prime: 18089

Next Prime: 18097

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 79 × 229

Divisors: 1, 79, 229, 18091

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100011010101011

Octal: 43253

Duodecimal: A577

Hexadecimal: 46ab

Square: 327284281

Square Root: 134.50278807519194

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Composite numbers whose divisors (except 1) all contain the digit 9. A62680

Partial sums of A007694. A174030

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 27 ones. A31795

Numbers k such that k and k-1 both first appear in the same power of 2 (in base 10). A322919

G.f. A(x) satisfies A(x) = 1/( (1-x)² * (1 - x·A(x) - 2·x²*A'(x)) ). A386263

Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,1 5,2 6,2 7,2 polyhexes in any orientation on a planar nXnXn triangular grid. A155401

Array A read by upward antidiagonals in which the entry in row n and column k is defined by A(n,k) = (1 + 2ⁿ*(6·k-3+2*(-1)ⁿ))/3, n,k >= 1. A257499

Expansion of 1/((1-3·x)*(1-9·x)*(1-11·x)). A18091

Number of (n+3) X 7 0..2 matrices with each 4 X 4 subblock idempotent. A224724